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Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[thirdparty/linux.git] / drivers / net / macvlan.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (c) 2007 Patrick McHardy <kaber@trash.net>
4 *
5 * The code this is based on carried the following copyright notice:
6 * ---
7 * (C) Copyright 2001-2006
8 * Alex Zeffertt, Cambridge Broadband Ltd, ajz@cambridgebroadband.com
9 * Re-worked by Ben Greear <greearb@candelatech.com>
10 * ---
11 */
12 #include <linux/kernel.h>
13 #include <linux/types.h>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/errno.h>
17 #include <linux/slab.h>
18 #include <linux/string.h>
19 #include <linux/rculist.h>
20 #include <linux/notifier.h>
21 #include <linux/netdevice.h>
22 #include <linux/etherdevice.h>
23 #include <linux/net_tstamp.h>
24 #include <linux/ethtool.h>
25 #include <linux/if_arp.h>
26 #include <linux/if_vlan.h>
27 #include <linux/if_link.h>
28 #include <linux/if_macvlan.h>
29 #include <linux/hash.h>
30 #include <linux/workqueue.h>
31 #include <net/rtnetlink.h>
32 #include <net/xfrm.h>
33 #include <linux/netpoll.h>
34 #include <linux/phy.h>
35
36 #define MACVLAN_HASH_BITS 8
37 #define MACVLAN_HASH_SIZE (1<<MACVLAN_HASH_BITS)
38 #define MACVLAN_BC_QUEUE_LEN 1000
39
40 #define MACVLAN_F_PASSTHRU 1
41 #define MACVLAN_F_ADDRCHANGE 2
42
43 struct macvlan_port {
44 struct net_device *dev;
45 struct hlist_head vlan_hash[MACVLAN_HASH_SIZE];
46 struct list_head vlans;
47 struct sk_buff_head bc_queue;
48 struct work_struct bc_work;
49 u32 flags;
50 int count;
51 struct hlist_head vlan_source_hash[MACVLAN_HASH_SIZE];
52 DECLARE_BITMAP(mc_filter, MACVLAN_MC_FILTER_SZ);
53 unsigned char perm_addr[ETH_ALEN];
54 };
55
56 struct macvlan_source_entry {
57 struct hlist_node hlist;
58 struct macvlan_dev *vlan;
59 unsigned char addr[6+2] __aligned(sizeof(u16));
60 struct rcu_head rcu;
61 };
62
63 struct macvlan_skb_cb {
64 const struct macvlan_dev *src;
65 };
66
67 #define MACVLAN_SKB_CB(__skb) ((struct macvlan_skb_cb *)&((__skb)->cb[0]))
68
69 static void macvlan_port_destroy(struct net_device *dev);
70
71 static inline bool macvlan_passthru(const struct macvlan_port *port)
72 {
73 return port->flags & MACVLAN_F_PASSTHRU;
74 }
75
76 static inline void macvlan_set_passthru(struct macvlan_port *port)
77 {
78 port->flags |= MACVLAN_F_PASSTHRU;
79 }
80
81 static inline bool macvlan_addr_change(const struct macvlan_port *port)
82 {
83 return port->flags & MACVLAN_F_ADDRCHANGE;
84 }
85
86 static inline void macvlan_set_addr_change(struct macvlan_port *port)
87 {
88 port->flags |= MACVLAN_F_ADDRCHANGE;
89 }
90
91 static inline void macvlan_clear_addr_change(struct macvlan_port *port)
92 {
93 port->flags &= ~MACVLAN_F_ADDRCHANGE;
94 }
95
96 /* Hash Ethernet address */
97 static u32 macvlan_eth_hash(const unsigned char *addr)
98 {
99 u64 value = get_unaligned((u64 *)addr);
100
101 /* only want 6 bytes */
102 #ifdef __BIG_ENDIAN
103 value >>= 16;
104 #else
105 value <<= 16;
106 #endif
107 return hash_64(value, MACVLAN_HASH_BITS);
108 }
109
110 static struct macvlan_port *macvlan_port_get_rcu(const struct net_device *dev)
111 {
112 return rcu_dereference(dev->rx_handler_data);
113 }
114
115 static struct macvlan_port *macvlan_port_get_rtnl(const struct net_device *dev)
116 {
117 return rtnl_dereference(dev->rx_handler_data);
118 }
119
120 static struct macvlan_dev *macvlan_hash_lookup(const struct macvlan_port *port,
121 const unsigned char *addr)
122 {
123 struct macvlan_dev *vlan;
124 u32 idx = macvlan_eth_hash(addr);
125
126 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[idx], hlist) {
127 if (ether_addr_equal_64bits(vlan->dev->dev_addr, addr))
128 return vlan;
129 }
130 return NULL;
131 }
132
133 static struct macvlan_source_entry *macvlan_hash_lookup_source(
134 const struct macvlan_dev *vlan,
135 const unsigned char *addr)
136 {
137 struct macvlan_source_entry *entry;
138 u32 idx = macvlan_eth_hash(addr);
139 struct hlist_head *h = &vlan->port->vlan_source_hash[idx];
140
141 hlist_for_each_entry_rcu(entry, h, hlist) {
142 if (ether_addr_equal_64bits(entry->addr, addr) &&
143 entry->vlan == vlan)
144 return entry;
145 }
146 return NULL;
147 }
148
149 static int macvlan_hash_add_source(struct macvlan_dev *vlan,
150 const unsigned char *addr)
151 {
152 struct macvlan_port *port = vlan->port;
153 struct macvlan_source_entry *entry;
154 struct hlist_head *h;
155
156 entry = macvlan_hash_lookup_source(vlan, addr);
157 if (entry)
158 return 0;
159
160 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
161 if (!entry)
162 return -ENOMEM;
163
164 ether_addr_copy(entry->addr, addr);
165 entry->vlan = vlan;
166 h = &port->vlan_source_hash[macvlan_eth_hash(addr)];
167 hlist_add_head_rcu(&entry->hlist, h);
168 vlan->macaddr_count++;
169
170 return 0;
171 }
172
173 static void macvlan_hash_add(struct macvlan_dev *vlan)
174 {
175 struct macvlan_port *port = vlan->port;
176 const unsigned char *addr = vlan->dev->dev_addr;
177 u32 idx = macvlan_eth_hash(addr);
178
179 hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[idx]);
180 }
181
182 static void macvlan_hash_del_source(struct macvlan_source_entry *entry)
183 {
184 hlist_del_rcu(&entry->hlist);
185 kfree_rcu(entry, rcu);
186 }
187
188 static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
189 {
190 hlist_del_rcu(&vlan->hlist);
191 if (sync)
192 synchronize_rcu();
193 }
194
195 static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
196 const unsigned char *addr)
197 {
198 macvlan_hash_del(vlan, true);
199 /* Now that we are unhashed it is safe to change the device
200 * address without confusing packet delivery.
201 */
202 memcpy(vlan->dev->dev_addr, addr, ETH_ALEN);
203 macvlan_hash_add(vlan);
204 }
205
206 static bool macvlan_addr_busy(const struct macvlan_port *port,
207 const unsigned char *addr)
208 {
209 /* Test to see if the specified address is
210 * currently in use by the underlying device or
211 * another macvlan.
212 */
213 if (!macvlan_passthru(port) && !macvlan_addr_change(port) &&
214 ether_addr_equal_64bits(port->dev->dev_addr, addr))
215 return true;
216
217 if (macvlan_hash_lookup(port, addr))
218 return true;
219
220 return false;
221 }
222
223
224 static int macvlan_broadcast_one(struct sk_buff *skb,
225 const struct macvlan_dev *vlan,
226 const struct ethhdr *eth, bool local)
227 {
228 struct net_device *dev = vlan->dev;
229
230 if (local)
231 return __dev_forward_skb(dev, skb);
232
233 skb->dev = dev;
234 if (ether_addr_equal_64bits(eth->h_dest, dev->broadcast))
235 skb->pkt_type = PACKET_BROADCAST;
236 else
237 skb->pkt_type = PACKET_MULTICAST;
238
239 return 0;
240 }
241
242 static u32 macvlan_hash_mix(const struct macvlan_dev *vlan)
243 {
244 return (u32)(((unsigned long)vlan) >> L1_CACHE_SHIFT);
245 }
246
247
248 static unsigned int mc_hash(const struct macvlan_dev *vlan,
249 const unsigned char *addr)
250 {
251 u32 val = __get_unaligned_cpu32(addr + 2);
252
253 val ^= macvlan_hash_mix(vlan);
254 return hash_32(val, MACVLAN_MC_FILTER_BITS);
255 }
256
257 static void macvlan_broadcast(struct sk_buff *skb,
258 const struct macvlan_port *port,
259 struct net_device *src,
260 enum macvlan_mode mode)
261 {
262 const struct ethhdr *eth = eth_hdr(skb);
263 const struct macvlan_dev *vlan;
264 struct sk_buff *nskb;
265 unsigned int i;
266 int err;
267 unsigned int hash;
268
269 if (skb->protocol == htons(ETH_P_PAUSE))
270 return;
271
272 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
273 hlist_for_each_entry_rcu(vlan, &port->vlan_hash[i], hlist) {
274 if (vlan->dev == src || !(vlan->mode & mode))
275 continue;
276
277 hash = mc_hash(vlan, eth->h_dest);
278 if (!test_bit(hash, vlan->mc_filter))
279 continue;
280
281 err = NET_RX_DROP;
282 nskb = skb_clone(skb, GFP_ATOMIC);
283 if (likely(nskb))
284 err = macvlan_broadcast_one(
285 nskb, vlan, eth,
286 mode == MACVLAN_MODE_BRIDGE) ?:
287 netif_rx_ni(nskb);
288 macvlan_count_rx(vlan, skb->len + ETH_HLEN,
289 err == NET_RX_SUCCESS, true);
290 }
291 }
292 }
293
294 static void macvlan_process_broadcast(struct work_struct *w)
295 {
296 struct macvlan_port *port = container_of(w, struct macvlan_port,
297 bc_work);
298 struct sk_buff *skb;
299 struct sk_buff_head list;
300
301 __skb_queue_head_init(&list);
302
303 spin_lock_bh(&port->bc_queue.lock);
304 skb_queue_splice_tail_init(&port->bc_queue, &list);
305 spin_unlock_bh(&port->bc_queue.lock);
306
307 while ((skb = __skb_dequeue(&list))) {
308 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
309
310 rcu_read_lock();
311
312 if (!src)
313 /* frame comes from an external address */
314 macvlan_broadcast(skb, port, NULL,
315 MACVLAN_MODE_PRIVATE |
316 MACVLAN_MODE_VEPA |
317 MACVLAN_MODE_PASSTHRU|
318 MACVLAN_MODE_BRIDGE);
319 else if (src->mode == MACVLAN_MODE_VEPA)
320 /* flood to everyone except source */
321 macvlan_broadcast(skb, port, src->dev,
322 MACVLAN_MODE_VEPA |
323 MACVLAN_MODE_BRIDGE);
324 else
325 /*
326 * flood only to VEPA ports, bridge ports
327 * already saw the frame on the way out.
328 */
329 macvlan_broadcast(skb, port, src->dev,
330 MACVLAN_MODE_VEPA);
331
332 rcu_read_unlock();
333
334 if (src)
335 dev_put(src->dev);
336 consume_skb(skb);
337 }
338 }
339
340 static void macvlan_broadcast_enqueue(struct macvlan_port *port,
341 const struct macvlan_dev *src,
342 struct sk_buff *skb)
343 {
344 struct sk_buff *nskb;
345 int err = -ENOMEM;
346
347 nskb = skb_clone(skb, GFP_ATOMIC);
348 if (!nskb)
349 goto err;
350
351 MACVLAN_SKB_CB(nskb)->src = src;
352
353 spin_lock(&port->bc_queue.lock);
354 if (skb_queue_len(&port->bc_queue) < MACVLAN_BC_QUEUE_LEN) {
355 if (src)
356 dev_hold(src->dev);
357 __skb_queue_tail(&port->bc_queue, nskb);
358 err = 0;
359 }
360 spin_unlock(&port->bc_queue.lock);
361
362 if (err)
363 goto free_nskb;
364
365 schedule_work(&port->bc_work);
366 return;
367
368 free_nskb:
369 kfree_skb(nskb);
370 err:
371 atomic_long_inc(&skb->dev->rx_dropped);
372 }
373
374 static void macvlan_flush_sources(struct macvlan_port *port,
375 struct macvlan_dev *vlan)
376 {
377 int i;
378
379 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
380 struct hlist_node *h, *n;
381
382 hlist_for_each_safe(h, n, &port->vlan_source_hash[i]) {
383 struct macvlan_source_entry *entry;
384
385 entry = hlist_entry(h, struct macvlan_source_entry,
386 hlist);
387 if (entry->vlan == vlan)
388 macvlan_hash_del_source(entry);
389 }
390 }
391 vlan->macaddr_count = 0;
392 }
393
394 static void macvlan_forward_source_one(struct sk_buff *skb,
395 struct macvlan_dev *vlan)
396 {
397 struct sk_buff *nskb;
398 struct net_device *dev;
399 int len;
400 int ret;
401
402 dev = vlan->dev;
403 if (unlikely(!(dev->flags & IFF_UP)))
404 return;
405
406 nskb = skb_clone(skb, GFP_ATOMIC);
407 if (!nskb)
408 return;
409
410 len = nskb->len + ETH_HLEN;
411 nskb->dev = dev;
412
413 if (ether_addr_equal_64bits(eth_hdr(skb)->h_dest, dev->dev_addr))
414 nskb->pkt_type = PACKET_HOST;
415
416 ret = netif_rx(nskb);
417 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
418 }
419
420 static void macvlan_forward_source(struct sk_buff *skb,
421 struct macvlan_port *port,
422 const unsigned char *addr)
423 {
424 struct macvlan_source_entry *entry;
425 u32 idx = macvlan_eth_hash(addr);
426 struct hlist_head *h = &port->vlan_source_hash[idx];
427
428 hlist_for_each_entry_rcu(entry, h, hlist) {
429 if (ether_addr_equal_64bits(entry->addr, addr))
430 macvlan_forward_source_one(skb, entry->vlan);
431 }
432 }
433
434 /* called under rcu_read_lock() from netif_receive_skb */
435 static rx_handler_result_t macvlan_handle_frame(struct sk_buff **pskb)
436 {
437 struct macvlan_port *port;
438 struct sk_buff *skb = *pskb;
439 const struct ethhdr *eth = eth_hdr(skb);
440 const struct macvlan_dev *vlan;
441 const struct macvlan_dev *src;
442 struct net_device *dev;
443 unsigned int len = 0;
444 int ret;
445 rx_handler_result_t handle_res;
446
447 port = macvlan_port_get_rcu(skb->dev);
448 if (is_multicast_ether_addr(eth->h_dest)) {
449 unsigned int hash;
450
451 skb = ip_check_defrag(dev_net(skb->dev), skb, IP_DEFRAG_MACVLAN);
452 if (!skb)
453 return RX_HANDLER_CONSUMED;
454 *pskb = skb;
455 eth = eth_hdr(skb);
456 macvlan_forward_source(skb, port, eth->h_source);
457 src = macvlan_hash_lookup(port, eth->h_source);
458 if (src && src->mode != MACVLAN_MODE_VEPA &&
459 src->mode != MACVLAN_MODE_BRIDGE) {
460 /* forward to original port. */
461 vlan = src;
462 ret = macvlan_broadcast_one(skb, vlan, eth, 0) ?:
463 netif_rx(skb);
464 handle_res = RX_HANDLER_CONSUMED;
465 goto out;
466 }
467
468 hash = mc_hash(NULL, eth->h_dest);
469 if (test_bit(hash, port->mc_filter))
470 macvlan_broadcast_enqueue(port, src, skb);
471
472 return RX_HANDLER_PASS;
473 }
474
475 macvlan_forward_source(skb, port, eth->h_source);
476 if (macvlan_passthru(port))
477 vlan = list_first_or_null_rcu(&port->vlans,
478 struct macvlan_dev, list);
479 else
480 vlan = macvlan_hash_lookup(port, eth->h_dest);
481 if (!vlan || vlan->mode == MACVLAN_MODE_SOURCE)
482 return RX_HANDLER_PASS;
483
484 dev = vlan->dev;
485 if (unlikely(!(dev->flags & IFF_UP))) {
486 kfree_skb(skb);
487 return RX_HANDLER_CONSUMED;
488 }
489 len = skb->len + ETH_HLEN;
490 skb = skb_share_check(skb, GFP_ATOMIC);
491 if (!skb) {
492 ret = NET_RX_DROP;
493 handle_res = RX_HANDLER_CONSUMED;
494 goto out;
495 }
496
497 *pskb = skb;
498 skb->dev = dev;
499 skb->pkt_type = PACKET_HOST;
500
501 ret = NET_RX_SUCCESS;
502 handle_res = RX_HANDLER_ANOTHER;
503 out:
504 macvlan_count_rx(vlan, len, ret == NET_RX_SUCCESS, false);
505 return handle_res;
506 }
507
508 static int macvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
509 {
510 const struct macvlan_dev *vlan = netdev_priv(dev);
511 const struct macvlan_port *port = vlan->port;
512 const struct macvlan_dev *dest;
513
514 if (vlan->mode == MACVLAN_MODE_BRIDGE) {
515 const struct ethhdr *eth = (void *)skb->data;
516
517 /* send to other bridge ports directly */
518 if (is_multicast_ether_addr(eth->h_dest)) {
519 macvlan_broadcast(skb, port, dev, MACVLAN_MODE_BRIDGE);
520 goto xmit_world;
521 }
522
523 dest = macvlan_hash_lookup(port, eth->h_dest);
524 if (dest && dest->mode == MACVLAN_MODE_BRIDGE) {
525 /* send to lowerdev first for its network taps */
526 dev_forward_skb(vlan->lowerdev, skb);
527
528 return NET_XMIT_SUCCESS;
529 }
530 }
531 xmit_world:
532 skb->dev = vlan->lowerdev;
533 return dev_queue_xmit_accel(skb,
534 netdev_get_sb_channel(dev) ? dev : NULL);
535 }
536
537 static inline netdev_tx_t macvlan_netpoll_send_skb(struct macvlan_dev *vlan, struct sk_buff *skb)
538 {
539 #ifdef CONFIG_NET_POLL_CONTROLLER
540 if (vlan->netpoll)
541 netpoll_send_skb(vlan->netpoll, skb);
542 #else
543 BUG();
544 #endif
545 return NETDEV_TX_OK;
546 }
547
548 static netdev_tx_t macvlan_start_xmit(struct sk_buff *skb,
549 struct net_device *dev)
550 {
551 struct macvlan_dev *vlan = netdev_priv(dev);
552 unsigned int len = skb->len;
553 int ret;
554
555 if (unlikely(netpoll_tx_running(dev)))
556 return macvlan_netpoll_send_skb(vlan, skb);
557
558 ret = macvlan_queue_xmit(skb, dev);
559
560 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
561 struct vlan_pcpu_stats *pcpu_stats;
562
563 pcpu_stats = this_cpu_ptr(vlan->pcpu_stats);
564 u64_stats_update_begin(&pcpu_stats->syncp);
565 pcpu_stats->tx_packets++;
566 pcpu_stats->tx_bytes += len;
567 u64_stats_update_end(&pcpu_stats->syncp);
568 } else {
569 this_cpu_inc(vlan->pcpu_stats->tx_dropped);
570 }
571 return ret;
572 }
573
574 static int macvlan_hard_header(struct sk_buff *skb, struct net_device *dev,
575 unsigned short type, const void *daddr,
576 const void *saddr, unsigned len)
577 {
578 const struct macvlan_dev *vlan = netdev_priv(dev);
579 struct net_device *lowerdev = vlan->lowerdev;
580
581 return dev_hard_header(skb, lowerdev, type, daddr,
582 saddr ? : dev->dev_addr, len);
583 }
584
585 static const struct header_ops macvlan_hard_header_ops = {
586 .create = macvlan_hard_header,
587 .parse = eth_header_parse,
588 .cache = eth_header_cache,
589 .cache_update = eth_header_cache_update,
590 };
591
592 static int macvlan_open(struct net_device *dev)
593 {
594 struct macvlan_dev *vlan = netdev_priv(dev);
595 struct net_device *lowerdev = vlan->lowerdev;
596 int err;
597
598 if (macvlan_passthru(vlan->port)) {
599 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC)) {
600 err = dev_set_promiscuity(lowerdev, 1);
601 if (err < 0)
602 goto out;
603 }
604 goto hash_add;
605 }
606
607 err = -EADDRINUSE;
608 if (macvlan_addr_busy(vlan->port, dev->dev_addr))
609 goto out;
610
611 /* Attempt to populate accel_priv which is used to offload the L2
612 * forwarding requests for unicast packets.
613 */
614 if (lowerdev->features & NETIF_F_HW_L2FW_DOFFLOAD)
615 vlan->accel_priv =
616 lowerdev->netdev_ops->ndo_dfwd_add_station(lowerdev, dev);
617
618 /* If earlier attempt to offload failed, or accel_priv is not
619 * populated we must add the unicast address to the lower device.
620 */
621 if (IS_ERR_OR_NULL(vlan->accel_priv)) {
622 vlan->accel_priv = NULL;
623 err = dev_uc_add(lowerdev, dev->dev_addr);
624 if (err < 0)
625 goto out;
626 }
627
628 if (dev->flags & IFF_ALLMULTI) {
629 err = dev_set_allmulti(lowerdev, 1);
630 if (err < 0)
631 goto del_unicast;
632 }
633
634 if (dev->flags & IFF_PROMISC) {
635 err = dev_set_promiscuity(lowerdev, 1);
636 if (err < 0)
637 goto clear_multi;
638 }
639
640 hash_add:
641 macvlan_hash_add(vlan);
642 return 0;
643
644 clear_multi:
645 if (dev->flags & IFF_ALLMULTI)
646 dev_set_allmulti(lowerdev, -1);
647 del_unicast:
648 if (vlan->accel_priv) {
649 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
650 vlan->accel_priv);
651 vlan->accel_priv = NULL;
652 } else {
653 dev_uc_del(lowerdev, dev->dev_addr);
654 }
655 out:
656 return err;
657 }
658
659 static int macvlan_stop(struct net_device *dev)
660 {
661 struct macvlan_dev *vlan = netdev_priv(dev);
662 struct net_device *lowerdev = vlan->lowerdev;
663
664 if (vlan->accel_priv) {
665 lowerdev->netdev_ops->ndo_dfwd_del_station(lowerdev,
666 vlan->accel_priv);
667 vlan->accel_priv = NULL;
668 }
669
670 dev_uc_unsync(lowerdev, dev);
671 dev_mc_unsync(lowerdev, dev);
672
673 if (macvlan_passthru(vlan->port)) {
674 if (!(vlan->flags & MACVLAN_FLAG_NOPROMISC))
675 dev_set_promiscuity(lowerdev, -1);
676 goto hash_del;
677 }
678
679 if (dev->flags & IFF_ALLMULTI)
680 dev_set_allmulti(lowerdev, -1);
681
682 if (dev->flags & IFF_PROMISC)
683 dev_set_promiscuity(lowerdev, -1);
684
685 dev_uc_del(lowerdev, dev->dev_addr);
686
687 hash_del:
688 macvlan_hash_del(vlan, !dev->dismantle);
689 return 0;
690 }
691
692 static int macvlan_sync_address(struct net_device *dev, unsigned char *addr)
693 {
694 struct macvlan_dev *vlan = netdev_priv(dev);
695 struct net_device *lowerdev = vlan->lowerdev;
696 struct macvlan_port *port = vlan->port;
697 int err;
698
699 if (!(dev->flags & IFF_UP)) {
700 /* Just copy in the new address */
701 ether_addr_copy(dev->dev_addr, addr);
702 } else {
703 /* Rehash and update the device filters */
704 if (macvlan_addr_busy(vlan->port, addr))
705 return -EADDRINUSE;
706
707 if (!macvlan_passthru(port)) {
708 err = dev_uc_add(lowerdev, addr);
709 if (err)
710 return err;
711
712 dev_uc_del(lowerdev, dev->dev_addr);
713 }
714
715 macvlan_hash_change_addr(vlan, addr);
716 }
717 if (macvlan_passthru(port) && !macvlan_addr_change(port)) {
718 /* Since addr_change isn't set, we are here due to lower
719 * device change. Save the lower-dev address so we can
720 * restore it later.
721 */
722 ether_addr_copy(vlan->port->perm_addr,
723 lowerdev->dev_addr);
724 }
725 macvlan_clear_addr_change(port);
726 return 0;
727 }
728
729 static int macvlan_set_mac_address(struct net_device *dev, void *p)
730 {
731 struct macvlan_dev *vlan = netdev_priv(dev);
732 struct sockaddr *addr = p;
733
734 if (!is_valid_ether_addr(addr->sa_data))
735 return -EADDRNOTAVAIL;
736
737 /* If the addresses are the same, this is a no-op */
738 if (ether_addr_equal(dev->dev_addr, addr->sa_data))
739 return 0;
740
741 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
742 macvlan_set_addr_change(vlan->port);
743 return dev_set_mac_address(vlan->lowerdev, addr, NULL);
744 }
745
746 if (macvlan_addr_busy(vlan->port, addr->sa_data))
747 return -EADDRINUSE;
748
749 return macvlan_sync_address(dev, addr->sa_data);
750 }
751
752 static void macvlan_change_rx_flags(struct net_device *dev, int change)
753 {
754 struct macvlan_dev *vlan = netdev_priv(dev);
755 struct net_device *lowerdev = vlan->lowerdev;
756
757 if (dev->flags & IFF_UP) {
758 if (change & IFF_ALLMULTI)
759 dev_set_allmulti(lowerdev, dev->flags & IFF_ALLMULTI ? 1 : -1);
760 if (change & IFF_PROMISC)
761 dev_set_promiscuity(lowerdev,
762 dev->flags & IFF_PROMISC ? 1 : -1);
763
764 }
765 }
766
767 static void macvlan_compute_filter(unsigned long *mc_filter,
768 struct net_device *dev,
769 struct macvlan_dev *vlan)
770 {
771 if (dev->flags & (IFF_PROMISC | IFF_ALLMULTI)) {
772 bitmap_fill(mc_filter, MACVLAN_MC_FILTER_SZ);
773 } else {
774 struct netdev_hw_addr *ha;
775 DECLARE_BITMAP(filter, MACVLAN_MC_FILTER_SZ);
776
777 bitmap_zero(filter, MACVLAN_MC_FILTER_SZ);
778 netdev_for_each_mc_addr(ha, dev) {
779 __set_bit(mc_hash(vlan, ha->addr), filter);
780 }
781
782 __set_bit(mc_hash(vlan, dev->broadcast), filter);
783
784 bitmap_copy(mc_filter, filter, MACVLAN_MC_FILTER_SZ);
785 }
786 }
787
788 static void macvlan_set_mac_lists(struct net_device *dev)
789 {
790 struct macvlan_dev *vlan = netdev_priv(dev);
791
792 macvlan_compute_filter(vlan->mc_filter, dev, vlan);
793
794 dev_uc_sync(vlan->lowerdev, dev);
795 dev_mc_sync(vlan->lowerdev, dev);
796
797 /* This is slightly inaccurate as we're including the subscription
798 * list of vlan->lowerdev too.
799 *
800 * Bug alert: This only works if everyone has the same broadcast
801 * address as lowerdev. As soon as someone changes theirs this
802 * will break.
803 *
804 * However, this is already broken as when you change your broadcast
805 * address we don't get called.
806 *
807 * The solution is to maintain a list of broadcast addresses like
808 * we do for uc/mc, if you care.
809 */
810 macvlan_compute_filter(vlan->port->mc_filter, vlan->lowerdev, NULL);
811 }
812
813 static int macvlan_change_mtu(struct net_device *dev, int new_mtu)
814 {
815 struct macvlan_dev *vlan = netdev_priv(dev);
816
817 if (vlan->lowerdev->mtu < new_mtu)
818 return -EINVAL;
819 dev->mtu = new_mtu;
820 return 0;
821 }
822
823 static int macvlan_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
824 {
825 struct net_device *real_dev = macvlan_dev_real_dev(dev);
826 const struct net_device_ops *ops = real_dev->netdev_ops;
827 struct ifreq ifrr;
828 int err = -EOPNOTSUPP;
829
830 strscpy(ifrr.ifr_name, real_dev->name, IFNAMSIZ);
831 ifrr.ifr_ifru = ifr->ifr_ifru;
832
833 switch (cmd) {
834 case SIOCSHWTSTAMP:
835 if (!net_eq(dev_net(dev), &init_net))
836 break;
837 /* fall through */
838 case SIOCGHWTSTAMP:
839 if (netif_device_present(real_dev) && ops->ndo_do_ioctl)
840 err = ops->ndo_do_ioctl(real_dev, &ifrr, cmd);
841 break;
842 }
843
844 if (!err)
845 ifr->ifr_ifru = ifrr.ifr_ifru;
846
847 return err;
848 }
849
850 /*
851 * macvlan network devices have devices nesting below it and are a special
852 * "super class" of normal network devices; split their locks off into a
853 * separate class since they always nest.
854 */
855 static struct lock_class_key macvlan_netdev_addr_lock_key;
856
857 #define ALWAYS_ON_OFFLOADS \
858 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE | \
859 NETIF_F_GSO_ROBUST | NETIF_F_GSO_ENCAP_ALL)
860
861 #define ALWAYS_ON_FEATURES (ALWAYS_ON_OFFLOADS | NETIF_F_LLTX)
862
863 #define MACVLAN_FEATURES \
864 (NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \
865 NETIF_F_GSO | NETIF_F_TSO | NETIF_F_LRO | \
866 NETIF_F_TSO_ECN | NETIF_F_TSO6 | NETIF_F_GRO | NETIF_F_RXCSUM | \
867 NETIF_F_HW_VLAN_CTAG_FILTER | NETIF_F_HW_VLAN_STAG_FILTER)
868
869 #define MACVLAN_STATE_MASK \
870 ((1<<__LINK_STATE_NOCARRIER) | (1<<__LINK_STATE_DORMANT))
871
872 static int macvlan_get_nest_level(struct net_device *dev)
873 {
874 return ((struct macvlan_dev *)netdev_priv(dev))->nest_level;
875 }
876
877 static void macvlan_set_lockdep_class(struct net_device *dev)
878 {
879 netdev_lockdep_set_classes(dev);
880 lockdep_set_class_and_subclass(&dev->addr_list_lock,
881 &macvlan_netdev_addr_lock_key,
882 macvlan_get_nest_level(dev));
883 }
884
885 static int macvlan_init(struct net_device *dev)
886 {
887 struct macvlan_dev *vlan = netdev_priv(dev);
888 const struct net_device *lowerdev = vlan->lowerdev;
889 struct macvlan_port *port = vlan->port;
890
891 dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
892 (lowerdev->state & MACVLAN_STATE_MASK);
893 dev->features = lowerdev->features & MACVLAN_FEATURES;
894 dev->features |= ALWAYS_ON_FEATURES;
895 dev->hw_features |= NETIF_F_LRO;
896 dev->vlan_features = lowerdev->vlan_features & MACVLAN_FEATURES;
897 dev->vlan_features |= ALWAYS_ON_OFFLOADS;
898 dev->hw_enc_features |= dev->features;
899 dev->gso_max_size = lowerdev->gso_max_size;
900 dev->gso_max_segs = lowerdev->gso_max_segs;
901 dev->hard_header_len = lowerdev->hard_header_len;
902
903 macvlan_set_lockdep_class(dev);
904
905 vlan->pcpu_stats = netdev_alloc_pcpu_stats(struct vlan_pcpu_stats);
906 if (!vlan->pcpu_stats)
907 return -ENOMEM;
908
909 port->count += 1;
910
911 return 0;
912 }
913
914 static void macvlan_uninit(struct net_device *dev)
915 {
916 struct macvlan_dev *vlan = netdev_priv(dev);
917 struct macvlan_port *port = vlan->port;
918
919 free_percpu(vlan->pcpu_stats);
920
921 macvlan_flush_sources(port, vlan);
922 port->count -= 1;
923 if (!port->count)
924 macvlan_port_destroy(port->dev);
925 }
926
927 static void macvlan_dev_get_stats64(struct net_device *dev,
928 struct rtnl_link_stats64 *stats)
929 {
930 struct macvlan_dev *vlan = netdev_priv(dev);
931
932 if (vlan->pcpu_stats) {
933 struct vlan_pcpu_stats *p;
934 u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes;
935 u32 rx_errors = 0, tx_dropped = 0;
936 unsigned int start;
937 int i;
938
939 for_each_possible_cpu(i) {
940 p = per_cpu_ptr(vlan->pcpu_stats, i);
941 do {
942 start = u64_stats_fetch_begin_irq(&p->syncp);
943 rx_packets = p->rx_packets;
944 rx_bytes = p->rx_bytes;
945 rx_multicast = p->rx_multicast;
946 tx_packets = p->tx_packets;
947 tx_bytes = p->tx_bytes;
948 } while (u64_stats_fetch_retry_irq(&p->syncp, start));
949
950 stats->rx_packets += rx_packets;
951 stats->rx_bytes += rx_bytes;
952 stats->multicast += rx_multicast;
953 stats->tx_packets += tx_packets;
954 stats->tx_bytes += tx_bytes;
955 /* rx_errors & tx_dropped are u32, updated
956 * without syncp protection.
957 */
958 rx_errors += p->rx_errors;
959 tx_dropped += p->tx_dropped;
960 }
961 stats->rx_errors = rx_errors;
962 stats->rx_dropped = rx_errors;
963 stats->tx_dropped = tx_dropped;
964 }
965 }
966
967 static int macvlan_vlan_rx_add_vid(struct net_device *dev,
968 __be16 proto, u16 vid)
969 {
970 struct macvlan_dev *vlan = netdev_priv(dev);
971 struct net_device *lowerdev = vlan->lowerdev;
972
973 return vlan_vid_add(lowerdev, proto, vid);
974 }
975
976 static int macvlan_vlan_rx_kill_vid(struct net_device *dev,
977 __be16 proto, u16 vid)
978 {
979 struct macvlan_dev *vlan = netdev_priv(dev);
980 struct net_device *lowerdev = vlan->lowerdev;
981
982 vlan_vid_del(lowerdev, proto, vid);
983 return 0;
984 }
985
986 static int macvlan_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
987 struct net_device *dev,
988 const unsigned char *addr, u16 vid,
989 u16 flags,
990 struct netlink_ext_ack *extack)
991 {
992 struct macvlan_dev *vlan = netdev_priv(dev);
993 int err = -EINVAL;
994
995 /* Support unicast filter only on passthru devices.
996 * Multicast filter should be allowed on all devices.
997 */
998 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
999 return -EOPNOTSUPP;
1000
1001 if (flags & NLM_F_REPLACE)
1002 return -EOPNOTSUPP;
1003
1004 if (is_unicast_ether_addr(addr))
1005 err = dev_uc_add_excl(dev, addr);
1006 else if (is_multicast_ether_addr(addr))
1007 err = dev_mc_add_excl(dev, addr);
1008
1009 return err;
1010 }
1011
1012 static int macvlan_fdb_del(struct ndmsg *ndm, struct nlattr *tb[],
1013 struct net_device *dev,
1014 const unsigned char *addr, u16 vid)
1015 {
1016 struct macvlan_dev *vlan = netdev_priv(dev);
1017 int err = -EINVAL;
1018
1019 /* Support unicast filter only on passthru devices.
1020 * Multicast filter should be allowed on all devices.
1021 */
1022 if (!macvlan_passthru(vlan->port) && is_unicast_ether_addr(addr))
1023 return -EOPNOTSUPP;
1024
1025 if (is_unicast_ether_addr(addr))
1026 err = dev_uc_del(dev, addr);
1027 else if (is_multicast_ether_addr(addr))
1028 err = dev_mc_del(dev, addr);
1029
1030 return err;
1031 }
1032
1033 static void macvlan_ethtool_get_drvinfo(struct net_device *dev,
1034 struct ethtool_drvinfo *drvinfo)
1035 {
1036 strlcpy(drvinfo->driver, "macvlan", sizeof(drvinfo->driver));
1037 strlcpy(drvinfo->version, "0.1", sizeof(drvinfo->version));
1038 }
1039
1040 static int macvlan_ethtool_get_link_ksettings(struct net_device *dev,
1041 struct ethtool_link_ksettings *cmd)
1042 {
1043 const struct macvlan_dev *vlan = netdev_priv(dev);
1044
1045 return __ethtool_get_link_ksettings(vlan->lowerdev, cmd);
1046 }
1047
1048 static int macvlan_ethtool_get_ts_info(struct net_device *dev,
1049 struct ethtool_ts_info *info)
1050 {
1051 struct net_device *real_dev = macvlan_dev_real_dev(dev);
1052 const struct ethtool_ops *ops = real_dev->ethtool_ops;
1053 struct phy_device *phydev = real_dev->phydev;
1054
1055 if (phydev && phydev->drv && phydev->drv->ts_info) {
1056 return phydev->drv->ts_info(phydev, info);
1057 } else if (ops->get_ts_info) {
1058 return ops->get_ts_info(real_dev, info);
1059 } else {
1060 info->so_timestamping = SOF_TIMESTAMPING_RX_SOFTWARE |
1061 SOF_TIMESTAMPING_SOFTWARE;
1062 info->phc_index = -1;
1063 }
1064
1065 return 0;
1066 }
1067
1068 static netdev_features_t macvlan_fix_features(struct net_device *dev,
1069 netdev_features_t features)
1070 {
1071 struct macvlan_dev *vlan = netdev_priv(dev);
1072 netdev_features_t lowerdev_features = vlan->lowerdev->features;
1073 netdev_features_t mask;
1074
1075 features |= NETIF_F_ALL_FOR_ALL;
1076 features &= (vlan->set_features | ~MACVLAN_FEATURES);
1077 mask = features;
1078
1079 lowerdev_features &= (features | ~NETIF_F_LRO);
1080 features = netdev_increment_features(lowerdev_features, features, mask);
1081 features |= ALWAYS_ON_FEATURES;
1082 features &= (ALWAYS_ON_FEATURES | MACVLAN_FEATURES);
1083
1084 return features;
1085 }
1086
1087 #ifdef CONFIG_NET_POLL_CONTROLLER
1088 static void macvlan_dev_poll_controller(struct net_device *dev)
1089 {
1090 return;
1091 }
1092
1093 static int macvlan_dev_netpoll_setup(struct net_device *dev, struct netpoll_info *npinfo)
1094 {
1095 struct macvlan_dev *vlan = netdev_priv(dev);
1096 struct net_device *real_dev = vlan->lowerdev;
1097 struct netpoll *netpoll;
1098 int err = 0;
1099
1100 netpoll = kzalloc(sizeof(*netpoll), GFP_KERNEL);
1101 err = -ENOMEM;
1102 if (!netpoll)
1103 goto out;
1104
1105 err = __netpoll_setup(netpoll, real_dev);
1106 if (err) {
1107 kfree(netpoll);
1108 goto out;
1109 }
1110
1111 vlan->netpoll = netpoll;
1112
1113 out:
1114 return err;
1115 }
1116
1117 static void macvlan_dev_netpoll_cleanup(struct net_device *dev)
1118 {
1119 struct macvlan_dev *vlan = netdev_priv(dev);
1120 struct netpoll *netpoll = vlan->netpoll;
1121
1122 if (!netpoll)
1123 return;
1124
1125 vlan->netpoll = NULL;
1126
1127 __netpoll_free(netpoll);
1128 }
1129 #endif /* CONFIG_NET_POLL_CONTROLLER */
1130
1131 static int macvlan_dev_get_iflink(const struct net_device *dev)
1132 {
1133 struct macvlan_dev *vlan = netdev_priv(dev);
1134
1135 return vlan->lowerdev->ifindex;
1136 }
1137
1138 static const struct ethtool_ops macvlan_ethtool_ops = {
1139 .get_link = ethtool_op_get_link,
1140 .get_link_ksettings = macvlan_ethtool_get_link_ksettings,
1141 .get_drvinfo = macvlan_ethtool_get_drvinfo,
1142 .get_ts_info = macvlan_ethtool_get_ts_info,
1143 };
1144
1145 static const struct net_device_ops macvlan_netdev_ops = {
1146 .ndo_init = macvlan_init,
1147 .ndo_uninit = macvlan_uninit,
1148 .ndo_open = macvlan_open,
1149 .ndo_stop = macvlan_stop,
1150 .ndo_start_xmit = macvlan_start_xmit,
1151 .ndo_change_mtu = macvlan_change_mtu,
1152 .ndo_do_ioctl = macvlan_do_ioctl,
1153 .ndo_fix_features = macvlan_fix_features,
1154 .ndo_change_rx_flags = macvlan_change_rx_flags,
1155 .ndo_set_mac_address = macvlan_set_mac_address,
1156 .ndo_set_rx_mode = macvlan_set_mac_lists,
1157 .ndo_get_stats64 = macvlan_dev_get_stats64,
1158 .ndo_validate_addr = eth_validate_addr,
1159 .ndo_vlan_rx_add_vid = macvlan_vlan_rx_add_vid,
1160 .ndo_vlan_rx_kill_vid = macvlan_vlan_rx_kill_vid,
1161 .ndo_fdb_add = macvlan_fdb_add,
1162 .ndo_fdb_del = macvlan_fdb_del,
1163 .ndo_fdb_dump = ndo_dflt_fdb_dump,
1164 .ndo_get_lock_subclass = macvlan_get_nest_level,
1165 #ifdef CONFIG_NET_POLL_CONTROLLER
1166 .ndo_poll_controller = macvlan_dev_poll_controller,
1167 .ndo_netpoll_setup = macvlan_dev_netpoll_setup,
1168 .ndo_netpoll_cleanup = macvlan_dev_netpoll_cleanup,
1169 #endif
1170 .ndo_get_iflink = macvlan_dev_get_iflink,
1171 .ndo_features_check = passthru_features_check,
1172 .ndo_change_proto_down = dev_change_proto_down_generic,
1173 };
1174
1175 void macvlan_common_setup(struct net_device *dev)
1176 {
1177 ether_setup(dev);
1178
1179 dev->min_mtu = 0;
1180 dev->max_mtu = ETH_MAX_MTU;
1181 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1182 netif_keep_dst(dev);
1183 dev->priv_flags |= IFF_UNICAST_FLT;
1184 dev->netdev_ops = &macvlan_netdev_ops;
1185 dev->needs_free_netdev = true;
1186 dev->header_ops = &macvlan_hard_header_ops;
1187 dev->ethtool_ops = &macvlan_ethtool_ops;
1188 }
1189 EXPORT_SYMBOL_GPL(macvlan_common_setup);
1190
1191 static void macvlan_setup(struct net_device *dev)
1192 {
1193 macvlan_common_setup(dev);
1194 dev->priv_flags |= IFF_NO_QUEUE;
1195 }
1196
1197 static int macvlan_port_create(struct net_device *dev)
1198 {
1199 struct macvlan_port *port;
1200 unsigned int i;
1201 int err;
1202
1203 if (dev->type != ARPHRD_ETHER || dev->flags & IFF_LOOPBACK)
1204 return -EINVAL;
1205
1206 if (netdev_is_rx_handler_busy(dev))
1207 return -EBUSY;
1208
1209 port = kzalloc(sizeof(*port), GFP_KERNEL);
1210 if (port == NULL)
1211 return -ENOMEM;
1212
1213 port->dev = dev;
1214 ether_addr_copy(port->perm_addr, dev->dev_addr);
1215 INIT_LIST_HEAD(&port->vlans);
1216 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1217 INIT_HLIST_HEAD(&port->vlan_hash[i]);
1218 for (i = 0; i < MACVLAN_HASH_SIZE; i++)
1219 INIT_HLIST_HEAD(&port->vlan_source_hash[i]);
1220
1221 skb_queue_head_init(&port->bc_queue);
1222 INIT_WORK(&port->bc_work, macvlan_process_broadcast);
1223
1224 err = netdev_rx_handler_register(dev, macvlan_handle_frame, port);
1225 if (err)
1226 kfree(port);
1227 else
1228 dev->priv_flags |= IFF_MACVLAN_PORT;
1229 return err;
1230 }
1231
1232 static void macvlan_port_destroy(struct net_device *dev)
1233 {
1234 struct macvlan_port *port = macvlan_port_get_rtnl(dev);
1235 struct sk_buff *skb;
1236
1237 dev->priv_flags &= ~IFF_MACVLAN_PORT;
1238 netdev_rx_handler_unregister(dev);
1239
1240 /* After this point, no packet can schedule bc_work anymore,
1241 * but we need to cancel it and purge left skbs if any.
1242 */
1243 cancel_work_sync(&port->bc_work);
1244
1245 while ((skb = __skb_dequeue(&port->bc_queue))) {
1246 const struct macvlan_dev *src = MACVLAN_SKB_CB(skb)->src;
1247
1248 if (src)
1249 dev_put(src->dev);
1250
1251 kfree_skb(skb);
1252 }
1253
1254 /* If the lower device address has been changed by passthru
1255 * macvlan, put it back.
1256 */
1257 if (macvlan_passthru(port) &&
1258 !ether_addr_equal(port->dev->dev_addr, port->perm_addr)) {
1259 struct sockaddr sa;
1260
1261 sa.sa_family = port->dev->type;
1262 memcpy(&sa.sa_data, port->perm_addr, port->dev->addr_len);
1263 dev_set_mac_address(port->dev, &sa, NULL);
1264 }
1265
1266 kfree(port);
1267 }
1268
1269 static int macvlan_validate(struct nlattr *tb[], struct nlattr *data[],
1270 struct netlink_ext_ack *extack)
1271 {
1272 if (tb[IFLA_ADDRESS]) {
1273 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1274 return -EINVAL;
1275 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1276 return -EADDRNOTAVAIL;
1277 }
1278
1279 if (!data)
1280 return 0;
1281
1282 if (data[IFLA_MACVLAN_FLAGS] &&
1283 nla_get_u16(data[IFLA_MACVLAN_FLAGS]) & ~MACVLAN_FLAG_NOPROMISC)
1284 return -EINVAL;
1285
1286 if (data[IFLA_MACVLAN_MODE]) {
1287 switch (nla_get_u32(data[IFLA_MACVLAN_MODE])) {
1288 case MACVLAN_MODE_PRIVATE:
1289 case MACVLAN_MODE_VEPA:
1290 case MACVLAN_MODE_BRIDGE:
1291 case MACVLAN_MODE_PASSTHRU:
1292 case MACVLAN_MODE_SOURCE:
1293 break;
1294 default:
1295 return -EINVAL;
1296 }
1297 }
1298
1299 if (data[IFLA_MACVLAN_MACADDR_MODE]) {
1300 switch (nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE])) {
1301 case MACVLAN_MACADDR_ADD:
1302 case MACVLAN_MACADDR_DEL:
1303 case MACVLAN_MACADDR_FLUSH:
1304 case MACVLAN_MACADDR_SET:
1305 break;
1306 default:
1307 return -EINVAL;
1308 }
1309 }
1310
1311 if (data[IFLA_MACVLAN_MACADDR]) {
1312 if (nla_len(data[IFLA_MACVLAN_MACADDR]) != ETH_ALEN)
1313 return -EINVAL;
1314
1315 if (!is_valid_ether_addr(nla_data(data[IFLA_MACVLAN_MACADDR])))
1316 return -EADDRNOTAVAIL;
1317 }
1318
1319 if (data[IFLA_MACVLAN_MACADDR_COUNT])
1320 return -EINVAL;
1321
1322 return 0;
1323 }
1324
1325 /**
1326 * reconfigure list of remote source mac address
1327 * (only for macvlan devices in source mode)
1328 * Note regarding alignment: all netlink data is aligned to 4 Byte, which
1329 * suffices for both ether_addr_copy and ether_addr_equal_64bits usage.
1330 */
1331 static int macvlan_changelink_sources(struct macvlan_dev *vlan, u32 mode,
1332 struct nlattr *data[])
1333 {
1334 char *addr = NULL;
1335 int ret, rem, len;
1336 struct nlattr *nla, *head;
1337 struct macvlan_source_entry *entry;
1338
1339 if (data[IFLA_MACVLAN_MACADDR])
1340 addr = nla_data(data[IFLA_MACVLAN_MACADDR]);
1341
1342 if (mode == MACVLAN_MACADDR_ADD) {
1343 if (!addr)
1344 return -EINVAL;
1345
1346 return macvlan_hash_add_source(vlan, addr);
1347
1348 } else if (mode == MACVLAN_MACADDR_DEL) {
1349 if (!addr)
1350 return -EINVAL;
1351
1352 entry = macvlan_hash_lookup_source(vlan, addr);
1353 if (entry) {
1354 macvlan_hash_del_source(entry);
1355 vlan->macaddr_count--;
1356 }
1357 } else if (mode == MACVLAN_MACADDR_FLUSH) {
1358 macvlan_flush_sources(vlan->port, vlan);
1359 } else if (mode == MACVLAN_MACADDR_SET) {
1360 macvlan_flush_sources(vlan->port, vlan);
1361
1362 if (addr) {
1363 ret = macvlan_hash_add_source(vlan, addr);
1364 if (ret)
1365 return ret;
1366 }
1367
1368 if (!data || !data[IFLA_MACVLAN_MACADDR_DATA])
1369 return 0;
1370
1371 head = nla_data(data[IFLA_MACVLAN_MACADDR_DATA]);
1372 len = nla_len(data[IFLA_MACVLAN_MACADDR_DATA]);
1373
1374 nla_for_each_attr(nla, head, len, rem) {
1375 if (nla_type(nla) != IFLA_MACVLAN_MACADDR ||
1376 nla_len(nla) != ETH_ALEN)
1377 continue;
1378
1379 addr = nla_data(nla);
1380 ret = macvlan_hash_add_source(vlan, addr);
1381 if (ret)
1382 return ret;
1383 }
1384 } else {
1385 return -EINVAL;
1386 }
1387
1388 return 0;
1389 }
1390
1391 int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
1392 struct nlattr *tb[], struct nlattr *data[],
1393 struct netlink_ext_ack *extack)
1394 {
1395 struct macvlan_dev *vlan = netdev_priv(dev);
1396 struct macvlan_port *port;
1397 struct net_device *lowerdev;
1398 int err;
1399 int macmode;
1400 bool create = false;
1401
1402 if (!tb[IFLA_LINK])
1403 return -EINVAL;
1404
1405 lowerdev = __dev_get_by_index(src_net, nla_get_u32(tb[IFLA_LINK]));
1406 if (lowerdev == NULL)
1407 return -ENODEV;
1408
1409 /* When creating macvlans or macvtaps on top of other macvlans - use
1410 * the real device as the lowerdev.
1411 */
1412 if (netif_is_macvlan(lowerdev))
1413 lowerdev = macvlan_dev_real_dev(lowerdev);
1414
1415 if (!tb[IFLA_MTU])
1416 dev->mtu = lowerdev->mtu;
1417 else if (dev->mtu > lowerdev->mtu)
1418 return -EINVAL;
1419
1420 /* MTU range: 68 - lowerdev->max_mtu */
1421 dev->min_mtu = ETH_MIN_MTU;
1422 dev->max_mtu = lowerdev->max_mtu;
1423
1424 if (!tb[IFLA_ADDRESS])
1425 eth_hw_addr_random(dev);
1426
1427 if (!netif_is_macvlan_port(lowerdev)) {
1428 err = macvlan_port_create(lowerdev);
1429 if (err < 0)
1430 return err;
1431 create = true;
1432 }
1433 port = macvlan_port_get_rtnl(lowerdev);
1434
1435 /* Only 1 macvlan device can be created in passthru mode */
1436 if (macvlan_passthru(port)) {
1437 /* The macvlan port must be not created this time,
1438 * still goto destroy_macvlan_port for readability.
1439 */
1440 err = -EINVAL;
1441 goto destroy_macvlan_port;
1442 }
1443
1444 vlan->lowerdev = lowerdev;
1445 vlan->dev = dev;
1446 vlan->port = port;
1447 vlan->set_features = MACVLAN_FEATURES;
1448 vlan->nest_level = dev_get_nest_level(lowerdev) + 1;
1449
1450 vlan->mode = MACVLAN_MODE_VEPA;
1451 if (data && data[IFLA_MACVLAN_MODE])
1452 vlan->mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1453
1454 if (data && data[IFLA_MACVLAN_FLAGS])
1455 vlan->flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1456
1457 if (vlan->mode == MACVLAN_MODE_PASSTHRU) {
1458 if (port->count) {
1459 err = -EINVAL;
1460 goto destroy_macvlan_port;
1461 }
1462 macvlan_set_passthru(port);
1463 eth_hw_addr_inherit(dev, lowerdev);
1464 }
1465
1466 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1467 if (vlan->mode != MACVLAN_MODE_SOURCE) {
1468 err = -EINVAL;
1469 goto destroy_macvlan_port;
1470 }
1471 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1472 err = macvlan_changelink_sources(vlan, macmode, data);
1473 if (err)
1474 goto destroy_macvlan_port;
1475 }
1476
1477 err = register_netdevice(dev);
1478 if (err < 0)
1479 goto destroy_macvlan_port;
1480
1481 dev->priv_flags |= IFF_MACVLAN;
1482 err = netdev_upper_dev_link(lowerdev, dev, extack);
1483 if (err)
1484 goto unregister_netdev;
1485
1486 list_add_tail_rcu(&vlan->list, &port->vlans);
1487 netif_stacked_transfer_operstate(lowerdev, dev);
1488 linkwatch_fire_event(dev);
1489
1490 return 0;
1491
1492 unregister_netdev:
1493 /* macvlan_uninit would free the macvlan port */
1494 unregister_netdevice(dev);
1495 return err;
1496 destroy_macvlan_port:
1497 /* the macvlan port may be freed by macvlan_uninit when fail to register.
1498 * so we destroy the macvlan port only when it's valid.
1499 */
1500 if (create && macvlan_port_get_rtnl(lowerdev))
1501 macvlan_port_destroy(port->dev);
1502 return err;
1503 }
1504 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
1505
1506 static int macvlan_newlink(struct net *src_net, struct net_device *dev,
1507 struct nlattr *tb[], struct nlattr *data[],
1508 struct netlink_ext_ack *extack)
1509 {
1510 return macvlan_common_newlink(src_net, dev, tb, data, extack);
1511 }
1512
1513 void macvlan_dellink(struct net_device *dev, struct list_head *head)
1514 {
1515 struct macvlan_dev *vlan = netdev_priv(dev);
1516
1517 if (vlan->mode == MACVLAN_MODE_SOURCE)
1518 macvlan_flush_sources(vlan->port, vlan);
1519 list_del_rcu(&vlan->list);
1520 unregister_netdevice_queue(dev, head);
1521 netdev_upper_dev_unlink(vlan->lowerdev, dev);
1522 }
1523 EXPORT_SYMBOL_GPL(macvlan_dellink);
1524
1525 static int macvlan_changelink(struct net_device *dev,
1526 struct nlattr *tb[], struct nlattr *data[],
1527 struct netlink_ext_ack *extack)
1528 {
1529 struct macvlan_dev *vlan = netdev_priv(dev);
1530 enum macvlan_mode mode;
1531 bool set_mode = false;
1532 enum macvlan_macaddr_mode macmode;
1533 int ret;
1534
1535 /* Validate mode, but don't set yet: setting flags may fail. */
1536 if (data && data[IFLA_MACVLAN_MODE]) {
1537 set_mode = true;
1538 mode = nla_get_u32(data[IFLA_MACVLAN_MODE]);
1539 /* Passthrough mode can't be set or cleared dynamically */
1540 if ((mode == MACVLAN_MODE_PASSTHRU) !=
1541 (vlan->mode == MACVLAN_MODE_PASSTHRU))
1542 return -EINVAL;
1543 if (vlan->mode == MACVLAN_MODE_SOURCE &&
1544 vlan->mode != mode)
1545 macvlan_flush_sources(vlan->port, vlan);
1546 }
1547
1548 if (data && data[IFLA_MACVLAN_FLAGS]) {
1549 __u16 flags = nla_get_u16(data[IFLA_MACVLAN_FLAGS]);
1550 bool promisc = (flags ^ vlan->flags) & MACVLAN_FLAG_NOPROMISC;
1551 if (macvlan_passthru(vlan->port) && promisc) {
1552 int err;
1553
1554 if (flags & MACVLAN_FLAG_NOPROMISC)
1555 err = dev_set_promiscuity(vlan->lowerdev, -1);
1556 else
1557 err = dev_set_promiscuity(vlan->lowerdev, 1);
1558 if (err < 0)
1559 return err;
1560 }
1561 vlan->flags = flags;
1562 }
1563 if (set_mode)
1564 vlan->mode = mode;
1565 if (data && data[IFLA_MACVLAN_MACADDR_MODE]) {
1566 if (vlan->mode != MACVLAN_MODE_SOURCE)
1567 return -EINVAL;
1568 macmode = nla_get_u32(data[IFLA_MACVLAN_MACADDR_MODE]);
1569 ret = macvlan_changelink_sources(vlan, macmode, data);
1570 if (ret)
1571 return ret;
1572 }
1573 return 0;
1574 }
1575
1576 static size_t macvlan_get_size_mac(const struct macvlan_dev *vlan)
1577 {
1578 if (vlan->macaddr_count == 0)
1579 return 0;
1580 return nla_total_size(0) /* IFLA_MACVLAN_MACADDR_DATA */
1581 + vlan->macaddr_count * nla_total_size(sizeof(u8) * ETH_ALEN);
1582 }
1583
1584 static size_t macvlan_get_size(const struct net_device *dev)
1585 {
1586 struct macvlan_dev *vlan = netdev_priv(dev);
1587
1588 return (0
1589 + nla_total_size(4) /* IFLA_MACVLAN_MODE */
1590 + nla_total_size(2) /* IFLA_MACVLAN_FLAGS */
1591 + nla_total_size(4) /* IFLA_MACVLAN_MACADDR_COUNT */
1592 + macvlan_get_size_mac(vlan) /* IFLA_MACVLAN_MACADDR */
1593 );
1594 }
1595
1596 static int macvlan_fill_info_macaddr(struct sk_buff *skb,
1597 const struct macvlan_dev *vlan,
1598 const int i)
1599 {
1600 struct hlist_head *h = &vlan->port->vlan_source_hash[i];
1601 struct macvlan_source_entry *entry;
1602
1603 hlist_for_each_entry_rcu(entry, h, hlist) {
1604 if (entry->vlan != vlan)
1605 continue;
1606 if (nla_put(skb, IFLA_MACVLAN_MACADDR, ETH_ALEN, entry->addr))
1607 return 1;
1608 }
1609 return 0;
1610 }
1611
1612 static int macvlan_fill_info(struct sk_buff *skb,
1613 const struct net_device *dev)
1614 {
1615 struct macvlan_dev *vlan = netdev_priv(dev);
1616 int i;
1617 struct nlattr *nest;
1618
1619 if (nla_put_u32(skb, IFLA_MACVLAN_MODE, vlan->mode))
1620 goto nla_put_failure;
1621 if (nla_put_u16(skb, IFLA_MACVLAN_FLAGS, vlan->flags))
1622 goto nla_put_failure;
1623 if (nla_put_u32(skb, IFLA_MACVLAN_MACADDR_COUNT, vlan->macaddr_count))
1624 goto nla_put_failure;
1625 if (vlan->macaddr_count > 0) {
1626 nest = nla_nest_start_noflag(skb, IFLA_MACVLAN_MACADDR_DATA);
1627 if (nest == NULL)
1628 goto nla_put_failure;
1629
1630 for (i = 0; i < MACVLAN_HASH_SIZE; i++) {
1631 if (macvlan_fill_info_macaddr(skb, vlan, i))
1632 goto nla_put_failure;
1633 }
1634 nla_nest_end(skb, nest);
1635 }
1636 return 0;
1637
1638 nla_put_failure:
1639 return -EMSGSIZE;
1640 }
1641
1642 static const struct nla_policy macvlan_policy[IFLA_MACVLAN_MAX + 1] = {
1643 [IFLA_MACVLAN_MODE] = { .type = NLA_U32 },
1644 [IFLA_MACVLAN_FLAGS] = { .type = NLA_U16 },
1645 [IFLA_MACVLAN_MACADDR_MODE] = { .type = NLA_U32 },
1646 [IFLA_MACVLAN_MACADDR] = { .type = NLA_BINARY, .len = MAX_ADDR_LEN },
1647 [IFLA_MACVLAN_MACADDR_DATA] = { .type = NLA_NESTED },
1648 [IFLA_MACVLAN_MACADDR_COUNT] = { .type = NLA_U32 },
1649 };
1650
1651 int macvlan_link_register(struct rtnl_link_ops *ops)
1652 {
1653 /* common fields */
1654 ops->validate = macvlan_validate;
1655 ops->maxtype = IFLA_MACVLAN_MAX;
1656 ops->policy = macvlan_policy;
1657 ops->changelink = macvlan_changelink;
1658 ops->get_size = macvlan_get_size;
1659 ops->fill_info = macvlan_fill_info;
1660
1661 return rtnl_link_register(ops);
1662 };
1663 EXPORT_SYMBOL_GPL(macvlan_link_register);
1664
1665 static struct net *macvlan_get_link_net(const struct net_device *dev)
1666 {
1667 return dev_net(macvlan_dev_real_dev(dev));
1668 }
1669
1670 static struct rtnl_link_ops macvlan_link_ops = {
1671 .kind = "macvlan",
1672 .setup = macvlan_setup,
1673 .newlink = macvlan_newlink,
1674 .dellink = macvlan_dellink,
1675 .get_link_net = macvlan_get_link_net,
1676 .priv_size = sizeof(struct macvlan_dev),
1677 };
1678
1679 static int macvlan_device_event(struct notifier_block *unused,
1680 unsigned long event, void *ptr)
1681 {
1682 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1683 struct macvlan_dev *vlan, *next;
1684 struct macvlan_port *port;
1685 LIST_HEAD(list_kill);
1686
1687 if (!netif_is_macvlan_port(dev))
1688 return NOTIFY_DONE;
1689
1690 port = macvlan_port_get_rtnl(dev);
1691
1692 switch (event) {
1693 case NETDEV_UP:
1694 case NETDEV_DOWN:
1695 case NETDEV_CHANGE:
1696 list_for_each_entry(vlan, &port->vlans, list)
1697 netif_stacked_transfer_operstate(vlan->lowerdev,
1698 vlan->dev);
1699 break;
1700 case NETDEV_FEAT_CHANGE:
1701 list_for_each_entry(vlan, &port->vlans, list) {
1702 vlan->dev->gso_max_size = dev->gso_max_size;
1703 vlan->dev->gso_max_segs = dev->gso_max_segs;
1704 netdev_update_features(vlan->dev);
1705 }
1706 break;
1707 case NETDEV_CHANGEMTU:
1708 list_for_each_entry(vlan, &port->vlans, list) {
1709 if (vlan->dev->mtu <= dev->mtu)
1710 continue;
1711 dev_set_mtu(vlan->dev, dev->mtu);
1712 }
1713 break;
1714 case NETDEV_CHANGEADDR:
1715 if (!macvlan_passthru(port))
1716 return NOTIFY_DONE;
1717
1718 vlan = list_first_entry_or_null(&port->vlans,
1719 struct macvlan_dev,
1720 list);
1721
1722 if (macvlan_sync_address(vlan->dev, dev->dev_addr))
1723 return NOTIFY_BAD;
1724
1725 break;
1726 case NETDEV_UNREGISTER:
1727 /* twiddle thumbs on netns device moves */
1728 if (dev->reg_state != NETREG_UNREGISTERING)
1729 break;
1730
1731 list_for_each_entry_safe(vlan, next, &port->vlans, list)
1732 vlan->dev->rtnl_link_ops->dellink(vlan->dev, &list_kill);
1733 unregister_netdevice_many(&list_kill);
1734 break;
1735 case NETDEV_PRE_TYPE_CHANGE:
1736 /* Forbid underlaying device to change its type. */
1737 return NOTIFY_BAD;
1738
1739 case NETDEV_NOTIFY_PEERS:
1740 case NETDEV_BONDING_FAILOVER:
1741 case NETDEV_RESEND_IGMP:
1742 /* Propagate to all vlans */
1743 list_for_each_entry(vlan, &port->vlans, list)
1744 call_netdevice_notifiers(event, vlan->dev);
1745 }
1746 return NOTIFY_DONE;
1747 }
1748
1749 static struct notifier_block macvlan_notifier_block __read_mostly = {
1750 .notifier_call = macvlan_device_event,
1751 };
1752
1753 static int __init macvlan_init_module(void)
1754 {
1755 int err;
1756
1757 register_netdevice_notifier(&macvlan_notifier_block);
1758
1759 err = macvlan_link_register(&macvlan_link_ops);
1760 if (err < 0)
1761 goto err1;
1762 return 0;
1763 err1:
1764 unregister_netdevice_notifier(&macvlan_notifier_block);
1765 return err;
1766 }
1767
1768 static void __exit macvlan_cleanup_module(void)
1769 {
1770 rtnl_link_unregister(&macvlan_link_ops);
1771 unregister_netdevice_notifier(&macvlan_notifier_block);
1772 }
1773
1774 module_init(macvlan_init_module);
1775 module_exit(macvlan_cleanup_module);
1776
1777 MODULE_LICENSE("GPL");
1778 MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
1779 MODULE_DESCRIPTION("Driver for MAC address based VLANs");
1780 MODULE_ALIAS_RTNL_LINK("macvlan");
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